Add link to header navigation
The following code inserts a link for extended search into the headers top link navigation <reference name=”top.links”> <action method=”addLink”> <label>Advanced Search</label> <url>catalogsearch/advanced</url> <title>Advanced Search</title> <prepare>false</prepare> <urlParams></urlParams> <position>6</position> </action> </reference> It is really important, that all sub elements of  the action tag are in the exact this order as the corresponding parameters of the underlaying method Mage_Page_Block_Template_Links:: […]